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Ultimate Micro System

Features - D-M40



Following in the footsteps of the multi-award winning D-M39S, the new D-M40 features serious Hi-Fi quality CD Receiver RCD-M40 along with optimized two-way speaker system SC-M40. For almost 20 years now, Denon’s M Series has been developed to meet the needs of modern day audio enthusiast that want a micro size stereo system but with the least compromises on sound and build quality. The latest development comes with improved connectivity options such as two digital optical inputs to hook up a TV, set-top box or other digital gear that deserves improved audio quality. Of course it plays all sources like CD, FM radio or USB media including iDevices in impeccable quality too.

"Simple & Straight" Circuit Design

For Sound Purity and Free of Coloration

Denon’s popular M series gives you high sound quality based on the “simple & straight” concept. Circuitry is uncomplicated, signal paths are short, and all adverse influences on sound quality have been minimized. The circuit design and the way the chassis is built ensure that the sound you hear is utterly faithful to the original performance.

Direct Play For iPod and iPhone via USB

You can also listen to music files from your iPod by simply connecting it to the USB port with the USB cable that came with the iPod. Digital signals from the iPod are transmitted as is to the D-M40 and are processed by advanced audio circuitry to produce a clean, high-quality sound. Moreover, the D-M40’s USB port is not only capable of playing MP3 and WMA files, but also lossless FLAC, WAV and AAC.

Triple Noise Reduction Design

In an audio component where various circuits, boards, and wire layouts can influence each other, it is not possible to obtain satisfying specifications or sound simply by strengthening the power amp circuit. Denon has therefore eliminated three sources of noise to ensure that the sound is as clean as possible. Distortion from the input selector, electronic volume and power amp has been suppressed to improve the signal-to-noise ratio and produce an even smoother, dramatic sound.

Enjoy Premium Sound

The D-M40’s compact size allows for easy setup on a bookshelf, in a bedroom or in the home office. With several color combinations, it easily blends into one’s daily life, delivering impeccable performance at the same time.

Denon SC-M40 speaker

These speakers have been designed with Denon Hi-Fi craftsmanship and European Sound engineering. For best performance a high quality 12 cm woofer / midrange chassis has been combined with a high definition tweeter and a crossover network with selected components to reproduces the smoothness of natural sound.

Tweeter Unit Exploded View

Woofer Unit Exploded View

Specs - D-M40


High Quality Power Output 2 x 30 W

CD Compatibility: CD / CD-R/RW / WMA / MP3 o / o / o / o

USB Audio (Front) / Made for iPod / Made for iPhone o / o / o

Tone Control: Bass / Treble / Balance o / o / o

Clock o

Sleep Timer o

Programmable Timer: Once / Daily o / o


Analog In/out 1 / 0

Digital Optical In/Out 2 / _

iPod / iPhone compatible USB input o

Subwoofer PreOut o

Speaker Terminal: Click Fit / Screw _ / o

Headphone Out o


Power Output (6 ohm, 1kHz) 30 W

Number of channels 2

Freq. Response (Analog In) 20 Hz-20 kHz

Frequency Range FM 87.5 Mhz-107.9 MHz

Frequency Range AM 520 kHz-1710 kHz


Available color: Black o

Remote Control RC-1162

Power Consumption in W 70

Standby Consumption in W 0.3

Maximum Dimensions (W x D x H) in inches 8.27 x 12.13 x 4.53

Weight in LBS 8.82

Speakers: SC-M40

Type 2-way bass reflex

Drivers 4-3/4" bass-mid
1"dome high

Impedance (ohms) 6

Frequency range 45Hz-40kHz

Available colors: Black o

Maximum Dimensions (W x D x H) in inches 5.71 x 9.21 x 9.37

Weight in lbs 7.94

Downloads - D-M40

pdf file
D-M40 Owner's Manual - English

1.66 MB

pdf file
D-M40 Owner's Manual - French

1.69 MB

pdf file
D-M40 Quick Start Guide - English

0.72 MB

pdf file
D-M40 Quick Start Guide - French

0.73 MB

pdf file
SC-M40 Speakers Quick Start Guide

1.02 MB

pdf file
D-M40 Specification Sheet

1.92 MB

Reviews And Awards - D-M40

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Q&A - D-M40

Can I charge A e-cigerette on the usb port?

Asked by: Robert L M
Hey Robert, We do not recommend charging an e-cigarette on the unit.
Answered by: Denon Support
Date published: 2019-03-07

Hello. I cannot find any information about the subwoofer cross-over frequency of D-M40. What is the Crossover frequency for subwoofer and can it be adjusted? Is this cross-over frequency is locked or it kicks in only when a sub-woofer is attached?

Asked by: Raindrop
Hey Raindrop, This units subwoofer is full range. If you would like to control the crossover frequency you will need to connect an active subwoofer to the unit on the pre-out. Your subwoofer will need to have crossover frequency controls. From there you can make custom subwoofer settings. I hope this helps if not you can always give us a call to have one of our expert technical support team members assist with any other concerns you may have.
Answered by: Denon Support
Date published: 2019-03-06

RCD- M40. After a power outage, power light is flashing red, power cord is plugged into a surge suppressor, nothing works

Asked by: Oregon23
Hey Oregon, From what you are describing your RCD-M40 will need to be serviced. You can locate a service center on our webpage. The link to locating a service center is at the bottom of the webpage where you will see the link that says Find A Service Center. I hope this helps if not you can always give us a call to have one of our expert technical support team members assist with any other concerns you may have.
Answered by: Denon Support
Date published: 2019-03-06

Hi, Are 24-bit WAVs and FLACs supported?

Asked by: The Dude
Hello The Dude, The USB port supports: MP3, WMA, FLAC, WAV, and AAC file formats
Answered by: Ken C
Date published: 2018-10-07

Can the unit play SACD's?

Asked by: Edsp
Hello Edsp, No, the D M40 cannot play SA/CDs. You would have to look at a Marantz SA/CD player.
Answered by: Ken C
Date published: 2018-06-13

Can I lay my speakers horizontally on bookshelves or do they need to stay upright?

Asked by: Just wondering
Hello, Yes, you can lay them horizontally, that will not cause any issues.
Answered by: Ken C
Date published: 2018-06-06

Is the Denon D-M40 compatible with iPad 5th generation? version 11.3? Thanks

Asked by: Benoit
Hello Benoit, If using Bluetooth, then yes. The 5th Gen iPad will work with the D-M40.
Answered by: Ken C
Date published: 2018-04-24

Hello I have a pair of JBL ES30, are these speakers too much or too big for this unit?

Asked by: Vico
Hello Vico, You may not get the desired sound out of the JBLs powering them with the DM40 as you would like. They aren't too big but a bigger amp would sound better with them JBL speakers.
Answered by: Ken C
Date published: 2018-04-05
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